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atmi @fitte CORNELIUSv c. VAN ALSTINE,

or- NEW HAVEN, coNNEorIcUT.

Letters Patent No.' 111,495,A dated January 31, 1871,

IMPRQVEMENT N TR-USSS.

-The Schedule referred to in these Letters Patent and making part of the same.

To all whom. it may concern:

Bc it lknown that I, OORNELlUs G. E. 'VAN AL STINE, of New Haven, in the county ot' New Haven and State of Connecticut, have invented a new Im-l provement in Trusscs; 'and I do hereby ,declare the following, when taken in connection with the accompanying drawing and the letters of reference marked thereon, to be a full, clear, and exact description of the same, and which said drawing constitutes 'part of this speciiication, and represents iii-.

`liigurefl, a front view;

Figure 2, a side view, illustrating the manner of reversingfrom right to` left;

Figure 3, a transverse section of the joint Figures 4, 5, 6, and 7, detached parts; andjin Figure 8, a central section of the pad, fullsize. This invent-ion relates to an improvement in trusses, the object being to make the pad reversible-and selt'- adjusting; and

It consistsA l 1E irst, in attaching the pad to the band by conical spindle and socket, whereby the pad is rmly xed in any desirable position. Y

Second, the construction of the pad with a chamber, within which is arranged a universal bearing for a helical spring,'combined with two plates, one of which lies upon the said spring and free in the chamber, the other fixed to the pad, and between the two a double convex heador plate, to which a stud is ixedjto secure the' pad tothe band, by means of a double convex head, a universal adjustment of the pad is attained. f'

A is the pad. j B, the band, and to the band a spindle, a, is attached, nooks d being formed on the said spindle, as seen in ii 3.

gThe spindle a is made of conical shape, and over this the arm O, Ato which the pad is fixed, is placed, a socket, D,ibeing formed, corresponding to the conical spindle, and a nut, j, turned onto the spindle to press thejggsocket D onto a rm bearing; hence, by loosing the'nut, the arm G may be adjusted to any desired position and the nut reset. v

The pad A is xed to the arm C by a screw, E, formed thereon.

`opposite side of the arm, as denoted in broken 'lines in tig. 2 one position for the right hand-and the other for the left, and this is accomplished by simply loosing 'thenut and resetting, so that, once set, it is immovable except by intention.

l The pad is formed as seeniu tig. S, F being the ball or cushion, within which is formed a chamber, Gr, with a step, b, set in the center.

.A flat plate, H, of abont'the diameter of the chamber, -is provided with a helical spring,.denoted in solid black, iig. 5; also seen in iig. 8, with a seat, c, to set upou'the step b, as seenin tig. 8.

Onto this plate a second plate, I, is placed, upon which 4the screw E is formed or fixed, as seen in figs. 6 and 8, and over thisa covering-plate, L, is vplaced andl secured to the cushion, confining 'the parts within the chamber, as seen in tig. 8.

. The.snraces'of the plate I, which lie 4between the plates L and H, are made each convex, which pei'-, mits ot' a rolling movementpf the pad in any direction, the spring yielding to the pressure upon the pad by the arrangement of the plate I, readilyconforms to thedcsired position without being set, thus making the pad practically self-adj usting; and the angle of the arm which supports the pad may be adjusted with the' greatest nicety, 'which cannot be attained by any known adjustable truss. I do not wish to be understood as broadly claiming a chambered pad, as such, I am aware, is not new.-

I claim as my invention- The combination of a chambered-rpad, lgwith' a bearing, b, upon which rests the helical spring, provided with the seat c, the movable' plate H, fixed plate L, and the double convex plate or head I between thesaid two plates, the said head I provided witha stud or screw, E, for attachment to the arm o f a truss, substantially in the manner herein set forth.

CORNELIUS G..E. VAN ALSTINE.

Witnesses:`1

J. H. SHUMWAL A. J. TIBBrrs. 

